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' 1,62, May 24,1927. J. FJUNCOLN 9877 FRAME FOR DYNAMO ELECTRIC MACHINESFiled May 5, 1924 7 1 INVENTOR.

' Jimas 1. L limo/z? d ATTORNEYS Patented May 24, 1927.

UNITED STATES JAMES PATENT OFFICE,

n. LINcoLn, on CLEVELA D onro, ASSIGNOR TO THE LINCOLN ELECTRIC oom-IPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

FRAME FOR DYNAMIC-ELECTRIC MACHINES.

Application filed May 3,

In the construction of motors and other similar dynamo electricmachines, the main supporting frame, so far as I am aware, has alwaysheretofore been made of cast iron. The object of the present inventionis to provide, instead of such a cast iron frame, one that is fabricatedout of structural steel shapes, namely, one made of steel angle bars orchannels suitably shaped and then welded together to form a unitaryrigid frame. As a result, not only have I found it possible to provide astronger and more dependable construction while at the same time greatlyreducing the weight of such frame, but the cost is likewise greatlyreduced, and owing to the greater modulus of elasticity which such steelstructural elements possess over cast iron, consequential advantages arealso achieved in other respects.

To the accomplishment of the foregoing and related ends, the invention,then, consists of the means hereinafter fully described and particularlypointed out in the claims, the annexed drawing and the followingdescription setting forth in detail certain mechanism embodying theinvention, such disclosed means constituting,however, but one of variousmechanical forms in which the principle of the invention may be used.

In said annexed drawing Fig. 1 is partly a side elevation and partly acentral vertical section of a typical motor wherein my improvedconstruction of. frame is incorporated; Fig. 2 is a side elevation andFig.3 an end plan view of such frame by itself; Figs. 4 and 5 aretransverse sections of such frame taken on the planes indicated by thelines 4-4 and 5-5, Fig. 3, respectively; Fig. 6 is a sectioncorresponding with that of Fig. 4, but showing a modification inconstruction; and Fig. 7 is a plan view of the straight angle bar fromwhich one of the component parts of such frame is fashioned.

The only parts in the motor assembly shown in Fig. 1, to which attentionneedbe directed in the present connection, are the stator 1 and theframe 2 from which such stator is supported in proper position about therotor 3. As best shown in Figs. 2 and 3, the frame 2 includes, alongwith other parts presently to be mentioned, two similar 1924. Serial No.710,840.

frame rings 4, 4, each of which is made a from a straight steelangle bar5 (see Fig. 7), the one flange 5 of which is somewhat wider than theother flange 5". At the respective ends of the bar, said fiangeb -isbeveledas shown at 5, so that when the bar is rolled into circularshape, the'beveled faces 5 will contact on a radial line. The

weld 6 is preferably effected by means of an electric arc, using an arcpencil ofsuitable metal to fill in any space that may be i the figuresjust referred to, as well as in Fig. 2, the frames are thus securedtogether with the flanges 5 directed inwardly, -i; e. towards eachother, and in the caseof bars 7 the ends thereof are notched to interfitwith these flanges, such bars being of the same width as flange 5 Thebars 8, on the contrary, instead of being thus notched, lie

Wholly within the flanges 5, the inner edgeof such bar projectingslightly inwardly beyond the corresponding edges of flanges 5 Said bars7 and 8 constitutecross-tic bars, their ends which thus interfit withthe rings 2 being permanently welded to the flanges of the latter, asshown in Figs. 4

and 6and also in Fig. 3, so that a unitary and substantially rigidstructure is formed.

In addition to thus welding the cross tie bars to the rings 2, I alsosimilarly weld in the angle formed between the flanges 5 and 5 of theframe rings, at circumferentially spaced points thereabout, a series ofnuts 9 through which pass the bolts 10 that are required to hold inplace the plates that compose the stator 1.- The latter are further heldin place by means of fiat rings 11 that are locked against therespective sides of said stator by retaining rings 12 of squarecross-section fitting into notches 13 in the inner edges of the bars 7and 8,

all as shown in Fig. 1. Feet 14: on which.

the machine is designed to rest, are linally welded at suitableoppositely spaced points on the flange 5 of each ring i A frame thusmade from structural steel shapes permanently welded together in thefashion described I have found is practically free from the danger ofbreakage experienced with cast iron, while at the same time it is bothstronger and decidedly less bulky than any cast iron frame of equivalentstrength. A consequential saving in cost is also achieved for not only,as heretofore pointed out, is a saving effected in weight of. metalen'iployed, it being necessary to use only one-third to one-half as manypounds to do the same work, but the steel employed will normally costless than one-half as much per pound as cast iron. It will beunderstood, finally, that while I have described theframe rings thatenter into my improved frame as being fabricated from steel angle bars,structural steel of other cross-sectional forms may be similarly usedwith the same or nearly equal advantage.

Other modes of applying the principle of my invention may be employedinstead of the one explained, change being made as re gards' themechanism or steps herein disclosed, provided the means or steps statedby any of the following claims or the equivalent of such stated means orsteps be employed.

I therefore particularly point out and distinctly claim as my invention:

1. In a dynamo electric machine,-the combination with the annularlaminated stator; of a supporting frame therefor, said frame includingtwoend-rings, each made from an elongated structural steel member formedinto a circle and having its ends Welded to gether, and cross-tie barswelded at their ends to said rings. respectively, said stator beingsecured to the inner faces of said crosstie bars.

2. In a dynamo electric machine, the combination With the annularlaminated stator; of a supporting frame therefor, said frame includingtwo end-rings, each made from an elongated structural steel member ofangular cross-section formed into a circle and having its ends weldedtogether, and crosstie bars Welded at their ends to said rings,respectively, said stator being secured to the inner faces of saidcross-tie bars.

3. Ina dynamo electric machine, the combination with the annularlaminated stator; of a supporting frame therefor, said frame includingtwo end-rings, each made from a steel angle bar formed into a circle andhaving its ends welded together with one flange of said bar constitutinga cylindrical portion and the other a flat inwardly directed portion ofthe end-ring, and cross-tic bars lying between such flat portions of thetwo end-rings and welded. at their ends to the latter, respectively,said stator being secured to the inner faces of said cross-tie bars.

4. In a dynamo electric machine, the combination with the annularlaminated stator; of a supporting frame therefor, said frame includingtwo end-rings, each made from a steel angle bar formed into a circle andhaving its ends welded together with one flange of said bar constitutinga cylindrical portion and the other a'fla-t inwardly directed portion ofthe end-ring, such cylindrical portions of the two end-rings beingdirected inwardly, and cross-tie bars. lying between such flat portionsof the two end rings and welded attheir ends to the latter,respectively, said stator being secured to the inner faces of saidcross-tie bars.

Signed by me, this 1st day of May, 1924.

JAMES F. LINCOLN.

